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| author | Eric DeVolder <eric.devolder@oracle.com> | 2020-04-13 23:22:04 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2020-05-15 23:15:26 +0200 |
| commit | f00c36641a253f4ea659ec3def5d87ba1336eb3b (patch) | |
| tree | 76f09c69c3be43f569107a128e5330a8d7864582 /tmpfiles.d/systemd-pstore.conf | |
| parent | Increase size of /run to 20% (diff) | |
| download | systemd-f00c36641a253f4ea659ec3def5d87ba1336eb3b.tar.xz systemd-f00c36641a253f4ea659ec3def5d87ba1336eb3b.zip | |
pstore: introduce tmpfiles.d/systemd-pstore.conf
The systemd pstore service archives the contents of /sys/fs/pstore
upon boot so that there is room for a subsequent dump. The issue is
that while the service is present, the kernel still needs to be
configured to write data into the pstore. The kernel has two
parameters, crash_kexec_post_notifiers and printk.always_kmsg_dump,
that control writes into pstore.
The crash_kexec_post_notifiers parameter enables the kernel to write
dmesg (including stack trace) into pstore upon a panic, and
printk.always_kmsg_dump parameter enables the kernel to write dmesg
upon a shutdown (shutdown, reboot, halt).
As it stands today, these parameters are not managed/manipulated by
the systemd pstore service, and are solely reliant upon the user [to
have the foresight] to set them on the kernel command line at boot, or
post boot via sysfs. Furthermore, the user would need to set these
parameters in a persistent fashion so that that they are enabled on
subsequent reboots.
This patch introduces the setting of these two kernel parameters via
the systemd tmpfiles technique.
Diffstat (limited to 'tmpfiles.d/systemd-pstore.conf')
| -rw-r--r-- | tmpfiles.d/systemd-pstore.conf | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tmpfiles.d/systemd-pstore.conf b/tmpfiles.d/systemd-pstore.conf new file mode 100644 index 0000000000..cb600ec1ee --- /dev/null +++ b/tmpfiles.d/systemd-pstore.conf @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: LGPL-2.1+ +# +# The systemd-pstore.service(1) archives the contents of /sys/fs/pstore +# upon boot so that there is room for a subsequent dump. This service +# is enabled with: +# systemctl enable systemd-pstore +# +# With the service enabled, the kernel still needs to be configured +# to write data into the pstore. The kernel has two parameters, +# crash_kexec_post_notifiers and printk.always_kmsg_dump, that +# control writes into pstore. +# +# The crash_kexec_post_notifiers parameter enables the kernel to write +# dmesg (including stack trace) into pstore upon a panic, and +# printk.always_kmsg_dump parameter enables the kernel to write dmesg +# upon a normal shutdown (shutdown, reboot, halt). +# +# To configure the kernel parameters, uncomment the appropriate +# line(s) below. The value written is either 'Y' to enable the +# kernel parameter, or 'N' to disable the kernel parameter. +# +# After making a change to this file, do: +# systemd-tmpfiles --create path/to/tmpfiles.d/systemd-pstore.conf +# +# These changes are automatically applied on future re-boots. + +d /var/lib/systemd/pstore 0755 root root 14d +#w /sys/module/printk/parameters/always_kmsg_dump - - - - Y +w /sys/module/kernel/parameters/crash_kexec_post_notifiers - - - - Y |